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No Model.) 3 Sheets-Sheet 1. A. P. G. BROWN. ROTARY ENGINE, PUMP, AND BLOWER.

Patented Qot. 31.1893.

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ROTARY ENGINE, PUMP, AND BLOWER.

Patented Oct. 31, 1898.

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No. 507,780. l Patented00t.'31,189s.

UNITED STATES PATENT OEEIcE.

ALEXANDER FRANCIS GARDEN BROWN, OF DALRY, SCOTLAND.

ROTARY ENG|NE,'PU|V|P, AND BLOWER.

SPECIFICATION forming part of LettersvPatent N0. 507,780, dated October 31, 1893. Application filed October 12, 1892. Serial No. 448.707. (No model.) Patented in England July 14, 1892I No. 12,915.

To all whom it may concern:

Be it known that LALEXANDER FRANCIS GARDEN BROWN, gentleman, a citizen of the United Kingdom of Great Britain and Ireland, residing at Swindridge Muir, Dalry, in the county of Ayr, Scotland, have invented new and useful Improvements in Rotary Engines, Pumps, and Blowers, (which have been patented in Great Britain by Letters Patent, dated July 14, 1892, No. l2,9l5;) and I do hereby declare that the following is av full, clear, and exact description of the invention, which will enable others skilled in the art or manufacture to which it relates to make and use the same.

In the drawings, Figure l, is a transverse v ertical section; Fig. 2, at' longitudinal section. Fig. 3, is a view similar to Fig. 1, of an engine having two or more abutments. Fig. 4, is a view of the pistons adapted to the form of engine shown in Fig. 3; Fig. 5, a View similar to Fig. 1, of a modification.

Under one modification of the improved engine represented in Figs. 1 and 2 the piston A is preferably of eccentric form and the abutment is composed of an oscillating arm or door B centered in a recess C in the cylinder casing D but instead of bearing directly on the periphery of the piston as is usual the said abutment has near its free end a segmental piece B pivoted or fitted to oscillate in a seat B2 formed in it the said segment B bearing on and being rocked by the motion of the piston A. Steam or other fluid is admitted to a chamber C formed at the back of the abutment arm or door B and passes through a port b therein and through a port b in the pivot on which the segment oscillates when the latter port b is brought in line with the first port b by the motion of the segment due to the travel of the piston A the oscillating segment thus acting as a steam admission valve; and from the ports b, b the steam enters the cylinder D in front of the oscillating segment B and impels the piston in the direction indicated by the arrow. By the travel of the piston A the motion imparted to the segment B is such as to completely open the ports b, b and close them during each revolution, steam being admitted on one side and being exhausted on the opposite side of the segment the exhausttaking place through a `port b2 in the pivot of the oscillating abutment B. In this arrangementsteam is admitted once for each revolution of the engine and may be cut 0E at any part of the revolution, but two or more abutment arms constructed as above described may be tted at intervals around the cylinder in which case steam may be admitted twice or oftener during each rotation.

The engine is made reversible by duplicating the abutment arm or arms and valve arrangements and cutting off the steam supply from the one valve while the other receives steam. The steam may also be expanded through a series of cylinders on the same or on separate shafts or as indicated diagram- .matically at Figs, 3 and4 a single cylinder D ymay be employed and fitted with a multiple throw piston A, A', A2, abutment arms provided with the distributing valve arrangements above described being provided for each piston and fitted to each of the compartments into which the cylinder D is divided by disks F formed between the several portions of the multiple throw pistons A, A', A2.

TheA shaft E carrying the piston or pistons where it passes through the ends of the cylinder D is packed steam tight by a sleeve G contained within a gland G both sleeve and gland having in thei'r lengths two diercnt diameters, a soft metal, asbestus or other packing ring H being inserted where the greater diameter of the sleeve meets the part of lesser diameter of the gland. The inner end of the sleeve G which is of the lesser diameter abuts against the piston A or that part of the shaft E carrying the piston and which is of greater diameter than the part passing through the sleeve G and around the said inner end a ring lis so placed that it bears upon the end of the piston A against which it is maintained steam tight by a -series of spiral or other springs J let into the inner end of the gland G.

In another modification of the engine represented in transverse vertical section at Fig. 5 the abutment or abutments is or are made in the form of one or ymore pistons or plungers B having a reciprocating motion in a chamber C extending radially from the top or side of the cylinder D and having formed at its or their inner end or ends a pivot seat ICO B2 for an oscillating segment B bearing on -l. In combination, the cylinder, the rotary 4o the periphery of the piston A and oscillated piston therein the oscillating segment bearthereby. The radial piston or plunger B is ing on the piston to be operated. thereby to hollow and is divided by a web or partition control the admission of steam from the sup- 5 B3 on one side of which steam is admitted ply, and the oscillating abutment to oscillat-e through a port and passage Z), b extending with the said segment, substantially as de- 45 through the plunger and the pivot on which scribed. the segment oscillates and thence the steam 2. In combination,the cylinder and casing enters the cylinder to impel forward the pishaving the inlet and outlet arranged adjacent 1o ton A. On the opposite side of the segment to each other, the rotary piston in the cylinthe exhaust steam escapes by asecond port b2 der and the oscillating valve device having 5o in the pivot piece of the segment B and at one side ot its center an inlet port leading through a port b3 into the hollow plunger B to one side of the cylinder and piston from on the side of the web opposite that on which the inlet of the casing and on the other side x 5 the live steam enters, the parts being so arof its center an outlet port leading from the ranged that the steam and exhaust passages other side ot' the cylinder and piston to the 55 are opened and closed at the proper times by outlet port, said oscillating device having the action of the engine piston A onthe oscil- `swinging movement. in the direction of the latingsegment B. In this modicationwhich pistons rotation and supported to have an 2o is also adapted to be compounded oroperated` additional movement to and from the center asamultiple expansion engine `in the man` of-the` cylinder, substantially as described. 6o ner described With-reference to Figs. 3 and4 8. In a rotary engine,p ump or blower the or by the use ot a series of cylinders, reversalu combination of a series of `pistons rotating of the engine is effected either byduplicatingr `Within a cylinder and set one in advanceof 25 the abutmentBor by admitting the steam by another anda corresponding seriesof abutthe exhaust passage b2 b3 and exhausting mentseach carrying an oscillating segment 65 through the steam inlet b b. '1 bearing on one of thepistons and operated Boththe abutment B of Figrl with its segthereby to automatically open and close steam mentB andthe segment B of 1Iilig. 6,'may; and exhaust ports formed irrthe abutment 3o betermed an i oscillating valve device as in and segment substantially as described.

both cases the `inlet and outlet i of steam is- `In witness whereof Ihave hereunto set` my 7o controlled thereby, `and both devices taken as@ :hand and seal this 17th day of August, `189?.

a whole have features common to both in thatl T 1 T f the inletis on one side of the center of the1 ALEXMDER lRMCIS GARDENBIO" [L' S'] 35 oscillating device while the outlet ison the `tVitnesses:

other side of said center. GEO. M. CRUIKSHANK,

`Having now described my invention, what WALLACE FAIRWEATHER, I desire to claim and secure by Letters Pat- `Chartered Potent Agents;62 St. Vincent Si., ent isl Glasgow. 

